| 摘要 |
Penicillins of the formula OR A PHARMACEUTICALLY-ACCEPTABLE, NONTOXIC SALT THEREOF, WHEREIN R1 and R2 are the same or different and each is hydrogen, fluorine, chlorine or bromine; or when R2 is hydrogen, R1 can also be cyano, hydroxyl, azido, amino or nitro; or R1 and R2 are bonded to a ring carbon atom and constitute a single oxygen atom; R3 is hydrogen, methyl, chlorine, bromine, cyano, methoxy or carboxyl; and N IS 2 TO 7; ARE USEFUL FOR THEIR ANTIBACTERIAL ACTIVITY. |
